EP1761418B1 - Sitzgurtaufroller mit elektromotor - Google Patents

Sitzgurtaufroller mit elektromotor Download PDF

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Publication number
EP1761418B1
EP1761418B1 EP05725619A EP05725619A EP1761418B1 EP 1761418 B1 EP1761418 B1 EP 1761418B1 EP 05725619 A EP05725619 A EP 05725619A EP 05725619 A EP05725619 A EP 05725619A EP 1761418 B1 EP1761418 B1 EP 1761418B1
Authority
EP
European Patent Office
Prior art keywords
seat belt
coupling
shaft
spring
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05725619A
Other languages
English (en)
French (fr)
Other versions
EP1761418A1 (de
Inventor
Martin Specht
Mark Seer
Thomas Heckmayr
Thomas Kilian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joyson Safety Systems Inc
Original Assignee
Joyson Safety Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Joyson Safety Systems Inc filed Critical Joyson Safety Systems Inc
Publication of EP1761418A1 publication Critical patent/EP1761418A1/de
Application granted granted Critical
Publication of EP1761418B1 publication Critical patent/EP1761418B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B60R2022/4446—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions using one spring and one additional retraction device in series
    • B60R2022/4466—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions using one spring and one additional retraction device in series the additional retraction device being an electric actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/4666—Reels with means to tension the belt in an emergency by forced winding up characterised by electric actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/468—Reels with means to tension the belt in an emergency by forced winding up characterised by clutching means between actuator and belt reel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators

Definitions

  • the invention relates to a seat belt retractor for of a vehicle having an electric motor for transmitting torque to the winding shaft of the retractor.
  • DE 100 13 869 C2 teaches a seat belt retractor wherein a torque is transmitted at a low revolution of a driving means to the motive spring to change the spring force.
  • the known device has a coupling, which at a high revolution transmits the torque supplied by the driving means to the winding shaft to wind up the seat belt.
  • the torque transmission can be carried out by a worm gear.
  • the transmission means, with which the torque of the driving means is transmitted to the winding shaft, as well as the motive spring, are provided on one side of the retractor or the winding shaft.
  • DE 199 27 731 C2 teaches a seat belt retractor wherein a coupling is provided which, depending on a signal emitted in a pre-crash situation, transmits a torque supplied by the electric motor to the belt reel to pretighten the seat belt.
  • a gear can also be provided between the output shaft of the electric motor and the winding shaft, whereby the gear and the motive spring, the spring force of which can also be adjusted by the electric motor driving means, are arranged on one side of the seat belt retractor or the winding shaft.
  • the spring force of the motive spring and hence the comfort perceived by the wearer of the seat belt can be adjusted during normal driving conditions.
  • the spring force can be increased for retracting the seat belt into a stored configuration.
  • the torque transmitted at an increased revolution by the electric motor driving means to the belt reel can be used to pretighten the seat belt in a driving situation in which a high crash risk is detected.
  • US 2001/0032902 discloses a seat belt retractor according to the preamble of claim 1, comprising a shaft for winding up a seat belt, a spring to bias the winding shaft in the winding direction of the seat belt, an electric motor to transmit torque to the spring, so as to change the spring force, a clutch which can be activated to engage the motor with the winding shaft for winding up the belt, and a toothed gear to transmit the torque from the electric motor to the winding shaft or the spring.
  • the clutch is a mechanical clutch comprising a deformable spring member which, when deformed by inertial force (rotation), brings the clutch into an engaged state.
  • WO 03/082640 discloses a seat belt retractor provided with a locking means which engages a locking toothed gearing system on the side of the housing.
  • the drive wheel of the tightening device can be connected to the belt shaft in a force-transmitting manner by the locking means for the belt shaft.
  • DE 19961799 discloses a seat belt retractor provided with an electric motor effecting a pretensioning device and a pyrotechnically driven tightening device.
  • the present invention according to claim 1 provides a seat belt retractor of the above mentioned type, in which a simple mounting of the gear of the coupling and the motive spring is achieved with a compact arrangement of the retractor.
  • the electric motor driving means and the pyrotechnical tightening device are secured to a common seat belt retractor frame, which is to be secured to the vehicle structure, so that the reaction forces generated by the drive of the electric motor driving means and the pyrotechnical tightening device are supported or received via the seat belt retractor frame at the vehicle structure.
  • Figure 1 is a diagrammatic view of a preferred embodiment of the invention.
  • the embodiment of the invention shown in the figure is a seat belt retractor for a seat belt 1, which can be incorporated into a vehicle, in particular a motor vehicle.
  • the seat belt retractor comprises a winding shaft 2 to wind up the seat belt 1 and a motive spring 3 to bias the winding shaft 2 in the winding direction of the seat belt 1.
  • An electric motor 4 preferably a direct current motor, is a driving means used for changing the spring force of the motive spring 3 and for driving the winding shaft 1, in particular in a pre-crash situation.
  • a gear 13 which will be described in more detail, and a coupling 5 are used.
  • the first clutch engagement surface 18 of the coupling can be moved into engagement with the second clutch engagement surface 19 by an electromagnetic force , or by an inertial force.
  • the gear 13, the coupling 5 and the motive spring 3 are preferably a pre-assembled unit.
  • the gear can comprise a toothed gear system.
  • the toothed gear system can comprise a screw gear, for instance with a front screw wheel pair, or of a worm gear.
  • the electric motor 4 can be subsequently secured to this unit or can be pre-assembled as a component of this unit.
  • this unit is mounted to the so-called mechanical side of the seat belt retractor.
  • the mechanical side of the seat belt retractor comprises in a conventional manner the vehicle sensitive sensor device as well as the belt webbing sensitive sensor device. These two sensor devices are designed in a known manner and are shown diagrammatically as a sensor device 14 in the drawing figure.
  • the vehicle sensitive part of the sensor device 14 reacts to an excessive acceleration or braking of the vehicle and causes a blocking of the winding shaft 3.
  • the belt webbing sensitive part of the sensor device 14 reacts to an excessive rotary acceleration of the winding shaft and also causes a blocking of the winding shaft 2.
  • a gear 13 comprises a drive wheel 11, which is rotatably mounted on a shaft 8 rotationally connected to the winding shaft 2, and which is rotationally connected to an outer spring end 10of the motive spring 3 by a rigid rotary connection.
  • the shaft 8 is an axial extension of the winding shaft 2.
  • the torque generated by the driving means 4 is transmitted to the drive wheel 11 via a further gear part, for instance a front screw wheel 12 or a worm wheel.
  • This torque transmission is suited for an arrangement of the driving means as shown in the figure, in which an output shaft 16 of the driving means runs perpendicular to the axis of the shaft 8.
  • the force-transmitting gear part can be a drive belt or a gear wheel or gear wheel pair.
  • the gear, the coupling and the motive spring are preferably arranged on the side of the seat belt retractor on which the vehicle and belt webbing sensitive sensor is provided.
  • This rigid rotary connection 15 can preferably be constantly provided.
  • the drive wheel 11 is rotationally connected to an outer spring end 10 of the motive spring 3.
  • the rigid rotary connection 15 is rotatably mounted around the shaft 8.
  • the rigid rotary connection 15 can for instance be securely connected to a spring housing 20, in which the motive spring 3 is arranged.
  • the coupling 5 comprises a first clutch engagement surface 18, which is movably mounted to a component rotationally connected to the drive wheel 11 against the force of a restoring spring (not shown in detail).
  • the first clutch engagement surface 18 is arranged on a coupling part 21 movably mounted on the spring housing 20.
  • the second clutch engagement surface 19 of the coupling 5 is rotationally connected to the shaft 8.
  • a second coupling part 22 is provided, on which the second clutch engagement surface 19 is located and which is rotationally connected to the shaft 8 at a fastening point 23, for instance via a spline. In this manner a rotational connection between the second clutch engagement surface 19 of the coupling 5 and the winding shaft 2 is created.
  • the two clutch engagement surfaces 18 and 19 of the coupling 5 can be toothed gears, frictional surfaces or the like, engaging one another during the coupling engagement.
  • a suitable coupling means can for instance also be a coupling as described in DE 198 44 092 C2 .
  • the coupling engagement can be caused by in particular an electromagnetic force or by inertial forces.
  • the components of the coupling 5 are arranged between the drive wheel 11 and the motive spring 3, in particular the spring housing 20.
  • the components of the coupling 5 are bridged by the rigid rotary connection 15.
  • the components of the gear 13, the coupling 5 and the motive spring 13 can be pre-assembled in sequence and in a flat arrangement with regard to the unit 17, and be mounted to the shaft 8 on the mechanical side of the seat belt retractor. It is furthermore possible to carry out the sequential assembly of the components of the unit 17 in a simple manner on the shaft 8 projecting from the mechanical side and to subsequently place them in a common housing.
  • the axial order of the sandwich arrangement of the drive wheel 11, the coupling 5 and the motive spring 3 can also be switched according to assembly requirements.
  • the inner drive wheel 11 or the parts of the coupling 5 can be positioned on the outside and the motive spring 3 can be arranged between the drive wheel 11 and the coupling 5. Any other axial order of the components, however, is also possible.
  • the power tightener can preferably be designed in the shape of a pyrotechnically driven tightening device 6 on the other side of the seat belt retractor or the winding shaft 2, as can be seen in the figure.
  • a drive wheel 24 rotationally connected to the winding shaft 2 is provided.
  • the drive wheel 24 can also be connected to the winding shaft 2 via a coupling which can be engaged for tightening purposes.
  • the tightening drive can be designed in a known manner, whereby a toothed rack drive, as known for instance from EP 0 629 531 B1 , or drive bodies, arranged in sequence in a guide channel, as known for instance from GB 2,325,896 , or ball-shaped drive bodies, as known from DE 196 02 549 A1 , can act upon the drive wheel 24.
  • a toothed rack drive as known for instance from EP 0 629 531 B1
  • drive bodies arranged in sequence in a guide channel, as known for instance from GB 2,325,896 , or ball-shaped drive bodies, as known from DE 196 02 549 A1 , can act upon the drive wheel 24.
  • the electric motor driving means 4 To adjust or change the spring force of the motive spring 3, the electric motor driving means 4 generates a torque at a low revolution, which is transmitted from the drive wheel 11 via the rigid rotary connection 15 to the outer spring end 10 of the motive spring 3.
  • the spring force of the motive spring 3 is increased or decreased. For instance, during the return of the seat belt 1 to a stored configuration after removal of the seat belt, the restoring force of the motive spring 3 can be correspondingly increased. During the application of the seat belt 1 the restoring force of the motive spring 3 can be decreased to increase the comfort perceived by the wearer.
  • an increased restoring force can be provided by the motive spring 3, to apply the seat belt to the body of the vehicle occupant in a perfect manner. Subsequently the already mentioned decreased restoring force of the motive spring 3 can be adjusted to adjust the comfort in wear during normal driving conditions.
  • the coupling 5 To transmit the driving torque of the driving means 4 to the winding shaft 2, the coupling 5 is brought into its engaged configuration .
  • the coupling 5 can be brought into an engaged configuration , for instance in a pre-crash driving situation by a an electromagnetic force .
  • the coupling 5 can be designed so that it can be automatically brought into the engaged configuration at an increased revolution of the driving means 4 by an inertial force or a centrifugal force.
  • the coupling device 5 can be designed according to the type taught in US 6,196,487 .
  • the driving force generated by the driving means 4 can be reversibly transmitted to the winding shaft 2 via the shaft 8. If no crash follows the pre-crash situation, the coupling 5 can be released, for instance by a brief turning of the driving means 5 into the opposite direction, and the belt webbing application force provided for normal driving conditions is restored at the seat belt through the corresponding adjustment of the restoring force of the motive spring 3.
  • the pyrotechnically driven tightening device 6 is activated so that the vehicle occupant is pulled back and held in the vehicle seat by a retensioning action with a high retracting force.
  • the electric motor driving means 4 can also be activated when the vehicle occupant has been in an out-off-position for more than a predetermined length of time. The vehicle occupant is then brought back into a normal seating position by the restoring force supplied by the driving means 4.
  • the pyrotechnical tightening device as well as the unit 17 is secured to a common frame, in particular to the belt retractor frame 7, which is to be secured to the vehicle structure.
  • a compact arrangement of the retractor is achieved, on the one hand ensuring the comfort of the wearer of the seat belt through a change in the spring force at a low revolution of the driving means as well as ensuring on the other hand a belt pretightening during a pre-crash situation at an increased revolution through transmission of the torque of the driving means to the winding shaft.
  • the pretightening function can be carried out in a reversible manner by the activated coupling with the aid of the electric motor driving means.
  • the energy for instance of a repeatedly chargeable electric memory for instance a condenser for operating the electric motor driving means, in particular of the electric motor, can be used.
  • the retractor furthermore assumes the function of power tightening in a crash that has occurred.
  • the pyrotechnically driven tightening device on the other side of the retractor is used to this effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Control Of Direct Current Motors (AREA)

Claims (5)

  1. Gurtaufroller für einen Sicherheitsgurt eines Fahrzeuges, der aufweist: eine Aufwickelwelle (2) eines Sicherheitsgurtaufrollers für das Aufwickeln eines Sicherheitsgurtes (1) und einen Gurtaufrollerrahmen (7); eine Treibfeder (3), um die Aufwickelwelle (2) in der Aufwickelrichtung des Sicherheitsgurtes vorzuspannen; einen Elektromotor (4), von dem ein Drehmoment auf die Treibfeder (3) übertragen werden kann, um die Federkraft zu verändern, und eine Kupplung (5), mittels der das Drehmoment des Elektromotors (4) auf die Aufwickelwelle (2) übertragen werden kann, um den Sicherheitsgurt (1) aufzuwickeln, und ein Getriebe (13), um das Drehmoment des Elektromotors (4) auf die Aufwickelwelle (2) oder die Treibfeder (3) zu übertragen, wobei die Treibfeder (3), die Kupplung (5) und das Getriebe (13) alle auf einer Seite des Rahmens (7) des Sicherheitsgurtaufrollers angeordnet sind, wobei das Getriebe (13) ein Antriebsrad (11) aufweist, das drehbar auf einer Welle (8) montiert ist, die drehbar und koaxial mit einer Aufwickelwelle (2) verbunden ist, und die drehbar mit einem äußeren Federende (10) der Treibfeder (3) mittels einer starren Drehverbindung (15) verbunden ist, und wobei eine erste Kupplungseingriffsfläche (18) der Kupplung (5) beweglich gegen eine Rückstellkraft auf einem Bauteil montiert ist, das sicher mit der starren Drehverbindung (15) verbunden und in der Lage ist, sich um die Welle (8) zu drehen, und wobei eine zweite Kupplungseingrißsfläche (19) der Kupplung (5) mit der Welle (8) verbunden ist und sich mit ihr dreht, dadurch gekennzeichnet, dass das Getriebe, die Kupplung und die Treibfeder auf der Seite des Rahmens (7) des Sicherheitsgurtaufrollers angeordnet sind, auf der eine fahrzeug- und gurtbandempfindliche Sensorvorrichtung (14) angeordnet ist, und dass sie als eine Einheit in einem gemeinsamen Gehäuse aufgenommen werden, das durch die starre Drehverbindung (15) gebildet wird und auf der Welle (8) montiert ist.
  2. Gurtaufroller nach Anspruch 1, bei dem die erste Kupplungseingriffsfläche (18) der Kupplung (5) in eine Eingriffskonfiguration mit der zweiten Kupplungseingriffsfläche (19) mittels einer elektromagnetischen Kraft oder mittels einer Trägheitskraft bewegt werden kann.
  3. Gurtaufroller nach einem der Ansprüche 1 bis 3, bei dem das Getriebe (13) ein Schneckengetriebe ist, insbesondere mit einem vorderen Schneckenradpaar oder Schneckenrad.
  4. Gurtaufroller nach einem der Ansprüche 1 bis 3, bei dem auf einer entgegengesetzten Seite des Rahmens (7) des Sicherheitsgurtaufrollers eine pyrotechnisch angetriebene Straffervorrichtung (6) angeordnet ist, die die Aufwickelwelle (2) in der Aufwickelrichtung für das angetriebene Straffen des Sicherheitsgurtes antreibt.
  5. Gurtaufroller nach einem der Ansprüche 1 bis 4, bei dem der Betrieb des Elektromotors (4) durch ein Vorcrashsensorsignal aktiviert wird, und bei dem der Betrieb der pyrotechnisch angetriebenen Straffervorrichtung (6) durch ein Ctashsensorsignal aktiviert wird.
EP05725619A 2004-06-24 2005-03-11 Sitzgurtaufroller mit elektromotor Not-in-force EP1761418B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202004009949U DE202004009949U1 (de) 2004-06-24 2004-06-24 Aufwickelvorrichtung für einen Sicherheitsgurt eines Fahrzeugs
PCT/US2005/008564 WO2006011923A1 (en) 2004-06-24 2005-03-11 Seat belt retractor with electric motor

Publications (2)

Publication Number Publication Date
EP1761418A1 EP1761418A1 (de) 2007-03-14
EP1761418B1 true EP1761418B1 (de) 2009-01-07

Family

ID=33305412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05725619A Not-in-force EP1761418B1 (de) 2004-06-24 2005-03-11 Sitzgurtaufroller mit elektromotor

Country Status (8)

Country Link
US (1) US20050284977A1 (de)
EP (1) EP1761418B1 (de)
JP (1) JP2008504160A (de)
KR (2) KR20070029206A (de)
CN (1) CN100515838C (de)
AT (1) ATE419998T1 (de)
DE (2) DE202004009949U1 (de)
WO (1) WO2006011923A1 (de)

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DE19961799B4 (de) * 1999-12-21 2004-03-25 Breed Automotive Technology, Inc., Lakeland Passives Sicherheitssystem eines Kraftfahrzeugs
DE10013869C2 (de) * 2000-03-21 2002-06-20 Breed Automotive Tech Komfort-Aufwickeleinrichtung für einen Sicherheitsgurt mit Motorrückholung
DE10020245C2 (de) * 2000-04-25 2002-02-14 Breed Automotive Tech Gurtaufroller für einen Fahrzeugsicherheitsgurt
JP2004518570A (ja) * 2000-05-10 2004-06-24 オートリブ・デベロプメント・アクツイエボラーグ ベルト緊張装置を持つ安全ベルト巻取り機
DE10039364C2 (de) * 2000-08-11 2002-08-08 Breed Automotive Tech Vorrichtung zum Aufrollen eines Sicherheitsgurtes
JP2002326558A (ja) * 2001-05-01 2002-11-12 Takata Corp シートベルト巻き取り装置の制御方法
JP3810060B2 (ja) * 2001-12-27 2006-08-16 タカタ株式会社 シートベルト巻取装置
JP2003267188A (ja) * 2002-03-19 2003-09-25 Tokai Rika Co Ltd シートベルト装置
DE10213906B4 (de) * 2002-03-28 2006-11-23 Autoliv Development Ab Leistungsstraffer
JP3924221B2 (ja) * 2002-08-12 2007-06-06 株式会社東海理化電機製作所 ウエビング巻取装置

Also Published As

Publication number Publication date
WO2006011923A1 (en) 2006-02-02
KR20080075555A (ko) 2008-08-18
EP1761418A1 (de) 2007-03-14
ATE419998T1 (de) 2009-01-15
JP2008504160A (ja) 2008-02-14
CN100515838C (zh) 2009-07-22
CN1933996A (zh) 2007-03-21
KR100890122B1 (ko) 2009-03-24
US20050284977A1 (en) 2005-12-29
DE602005012262D1 (de) 2009-02-26
DE202004009949U1 (de) 2004-10-14
KR20070029206A (ko) 2007-03-13

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